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ROBERT E. JONES, OF `New YORKQN. Y.

Lette/rs Patent No. 86,308, dated .Tanna/ry 26, 1869.

The Schedule referred to in these Letters Patent and making part of theIlmo.

To all whom it 'may concern:

Be it known that I, ROBERT E. J ONES, of the city, county, and State ofNew York, have invented a new and useful Adjustable Female Gauge; and Ido hereby declare that the following is a full, clear, and exactdescription ofthe same, reference being had to the accom# panyingdrawing, forming a part of this specification,

in Whch- A Figure l represents a longitudinal View of an adjustablefemale gauge, constructed according to my invention, and

Figure 2, a transverse section of the same.

Similar letters of reference indicate corresponding parts in bothfigures.

This invention is designed for ascertaining accurately the size ofcylindrical and other circular objects during the forming or finishingup ofthe same, or under any circumstances; and i It consists in theconstruction of. a female gauge, with a narrower opening intersectingits circular gauging-Opening radially, in a direction parallel with theaxis thereof, and with a graduatingscrew, whereby the size of the gaugemay be varied to some extent by the turning of the screw. i

In order that others may understand the construction and operation of myinvention, I will proceed to describe it with reference to the drawing.

A is ,a female gauge, consisting, like the ordinary female gauge, of apiece of steel or other metal, of circular or other form, with acircular opening or hole, B, formed through it, but having provided init, in addi- V tion to said circular opening, in which the gauging isopening radially, and parallel with its axis, said slit passingentirely-through the metal ou one side of the circular opening, as shownat c, and only partially through on its opposite side, as shown at c',leaving but little substance upon the latter side toform a neck, a.-

Said neck a holds the two equal parts f f of the gauge in their relativepositions to each other, with such degree of elasticity as may beimparted to it by the nature of the metal from which the gaugeisconstructed.

Through the two halves or parts f f of the gauge, and at the oppositeside of the circular gauging-hole B to that on which the neck a issituated, and square across the slit c, lis provided a screw-hole, e,for reception of au adjusting-screw, al, the screwing up of which willproduce a diminution ofthe size of the gauging-opening B, by the drawingtowards each other of the two halves f f of the gauge, and theunscrcwing of which will permit the expansion ofthe two halves f f ofthe gauge, and the enlargement of the said opening, by

means of the elasticity of the neck a..V v

What I claim as my invention, and desire to have secured by'LettersPatent, is

The female gauge A, constructed with a slit, c c', intersecting itsgauging-opening B., as described, and furnished with an adjusting-screw, d, operating substantially as herein described.

ROBERT E. JONES. Witnesses:

FRED.' HAYNES,

A., KINNIER.

performed, a narrow slit, c c', intersecting said circular ,K

